Hang on. To build that, you’d need the same understanding of gender essence that the original builders had- probably better. Nobody has that knowledge, and that’s the only thing keeping modern magic from fixing the unwilling victims of the Agri Valley curse- but if that knowledge gets out, even an artificial harvest stone won’t keep Cary’s enemies from getting back into Agri Valley.

So to make this thing work and keep her territory, Cary has to have the means to help people like Glenn, and actively keep those people from ever getting it.